PJM Grid Constraint Dashboard (2025)

Interactive Constraint Map

Zone Classifications & Scores

Click a row to expand DER recommendations. Click column headers to sort.

Zone ⇅	Classification ⇅	T-Score ⇅	G-Score ⇅	Congestion $/MWh ⇅	Max Congestion ⇅	Constrained Hrs % ⇅	Annual Hrs ⇅
AECO	transmission	0.5247	0.4650	$7.10	$121.17	59.3%	5,197
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
AEP	unconstrained	0.3627	0.4254	$3.17	$125.96	37.9%	3,320
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
APS	unconstrained	0.3393	0.4101	$2.98	$106.39	38.1%	3,340
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
ATSI	unconstrained	0.3819	0.4000	$3.54	$109.46	34.2%	2,993
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
BGE	unconstrained	0.4825	0.4900	$8.80	$232.92	64.0%	5,611
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
COMED	both	0.5250	0.6000	$9.02	$170.66	64.6%	5,659
Zones with both transmission and generation constraints benefit from a diversified DER portfolio. Dispatchable resources handle acute congestion events while consistent resources address the structural supply deficit. PrimarydispatchableBattery Storage, Demand Response Addresses acute congestion and generation shortfalls SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces chronic load, easing both transmission and generation stress TertiaryvariableSolar PV Adds local supply during daylight hours
DAY	unconstrained	0.3696	0.4294	$3.44	$125.12	36.5%	3,202
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
DEOK	unconstrained	0.3678	0.4569	$3.50	$127.16	37.1%	3,251
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
DOM	transmission	0.7417	0.4403	$11.76	$348.80	65.1%	5,702
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
DPL	transmission	0.6890	0.4937	$10.02	$251.72	61.9%	5,421
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
DUQ	unconstrained	0.3835	0.4183	$3.78	$116.69	33.5%	2,933
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
EKPC	unconstrained	0.4099	0.4853	$3.13	$128.41	36.7%	3,214
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
JCPL	transmission	0.5141	0.4620	$6.78	$122.84	58.3%	5,108
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
METED	unconstrained	0.4391	0.4410	$6.22	$128.36	55.6%	4,869
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
OVEC	generation	0.3727	0.5047	$3.56	$134.29	36.9%	3,236
Generation-constrained zones lack sufficient local supply. Consistent resources reduce demand permanently, easing the supply gap. Variable resources add local generation capacity. PrimaryconsistentEnergy Efficiency (Metered), Weatherization, Combined Heat & Power Permanently reduces demand, closing the local supply gap SecondaryvariableSolar PV, Wind Adds local generation to offset imports TertiarydispatchableBattery Storage, Demand Response Provides capacity during generation shortfalls
PECO	transmission	0.5444	0.4475	$7.31	$114.00	59.8%	5,238
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
PENELEC	unconstrained	0.4533	0.4327	$6.56	$119.57	67.2%	5,888
Unconstrained zones have adequate transmission and generation. Consistent resources provide long-term value through load reduction. DER investment priority is lower here relative to constrained zones. PrimaryconsistentEnergy Efficiency (Metered) Cost-effective load reduction with steady EAC generation SecondaryvariableSolar PV Clean energy addition with moderate grid benefit
PEPCO	transmission	0.5084	0.4749	$8.12	$238.81	61.9%	5,422
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
PPL	transmission	0.5360	0.4519	$7.51	$100.78	68.2%	5,978
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
PSEG	transmission	0.5357	0.4603	$6.85	$121.27	60.7%	5,320
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)
RECO	transmission	0.5471	0.4438	$7.44	$112.22	74.4%	6,518
Transmission-constrained zones have flow limits on power lines. Dispatchable resources reduce peak flows by providing local supply or reducing demand during congestion events. Consistent resources lower baseline load, reducing the magnitude of peak flows. PrimarydispatchableBattery Storage, Demand Response Dispatches during congestion events to reduce line loading SecondaryconsistentEnergy Efficiency (Metered), Weatherization Reduces baseline load, lowering chronic transmission stress TertiaryvariableSolar PV Adds local generation (value depends on coincidence with peak congestion)

Data Center Overlay

1,124

PJM Data Centers

48,884 MW

Estimated Total Capacity

760

Operational

364

Proposed

Growth Pressure Zones

These grid-constrained zones have significant proposed data center growth:

DOM transmission — 305 proposed, 925 total, ~43,122 MW
COMED both — 13 proposed, 63 total, ~1,874 MW

Zone ⇅	Classification ⇅	Total DCs ⇅	Operational ⇅	Proposed ⇅	Est. MW ⇅	Top County ⇅
AEP	unconstrained	27	12	15	1,908	Franklin
ATSI	unconstrained	9	2	7	10	ERIE
COMED	both	63	50	13	1,874	Cook
DAY	unconstrained	9	0	9	1,125	FAYETTE
DEOK	unconstrained	13	6	7	96	WARREN
DOM	transmission	925	620	305	43,122	Loudoun
DPL	transmission	9	9	0	113	New Castle
JCPL	transmission	12	10	2	111	Passaic
METED	unconstrained	1	1	0	5	Berks
PECO	transmission	7	6	1	35	Montgomery
PPL	transmission	4	3	1	90	Northampton
PSEG	transmission	45	41	4	395	Hudson

Visualizations

Transmission vs Generation Scores

Congestion Heatmap

Monthly Congestion Trends

Scoring Methodology

Transmission Score

Weighted composite of congestion-based metrics:

Congestion Ratio	\|congestion\| / \|LMP\|	30%
Congestion Volatility	Std dev of congestion prices	25%
Congested Hours %	Hours with \|congestion\| > $2/MWh	25%
Peak/Off-Peak Ratio	Peak vs off-peak congestion	20%

Generation Score

Weighted composite of energy-price metrics:

Energy Deviation	Zone vs system energy price	35%
Energy Volatility	Energy price std/mean	30%
Loss Component	Marginal loss ratio	20%
High Energy Hours %	Hours > avg + $3/MWh	15%

Classification Rules

both T-score ≥ 0.5 AND G-score ≥ 0.5

transmission T-score ≥ 0.5 AND G-score < 0.5

generation T-score < 0.5 AND G-score ≥ 0.5

unconstrained T-score < 0.5 AND G-score < 0.5

PJM Grid Constraint Classification Dashboard